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etcd config source implementation.
/*
* Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.helidon.config.etcd.internal.client;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import io.helidon.config.ConfigException;
import io.helidon.config.etcd.EtcdConfigSourceBuilder.EtcdApi;
import io.helidon.config.etcd.internal.client.v2.EtcdV2Client;
import io.helidon.config.etcd.internal.client.v3.EtcdV3Client;
/**
* Provides utility methods for etcd client package.
*/
public class EtcdUtils {
private EtcdUtils() {
}
private static final Map> ETCD_API_VERSION_CLASS_MAP =
Collections.unmodifiableMap(
new HashMap>() {
{
put(EtcdApi.v2, EtcdV2Client.class);
put(EtcdApi.v3, EtcdV3Client.class);
}
}
);
/**
* Returns an implementation class of etcd client for given etcd API version.
*
* @param etcdApiVersion etcd API version
* @return an implementation class of etcd client
*/
public static Class getClientClass(EtcdApi etcdApiVersion) {
return ETCD_API_VERSION_CLASS_MAP.get(etcdApiVersion);
}
/**
* Creates a new instance of {@link EtcdClient}'s implementation specified by parameter {@code clientClass} by invoking
* constructor with {@link URI uri} parameter.
*
* @param clientClass a client class
* @param uri an etcd uri
* @return an instance of client
* @throws ConfigException when client cannot be instantiated
*/
public static EtcdClient getClient(Class clientClass, URI uri) throws ConfigException {
try {
return clientClass.getDeclaredConstructor(URI.class).newInstance(uri);
} catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
throw new ConfigException(String.format("Cannot instantiate etcd client class %s.", clientClass.getName()), e);
}
}
}